title: Adsorption of CO2 from flue gas streams by a highly efficient and stable aminosilica adsorbent.
abstract: Three ordered mesoporous silicas (OMSs) with different pore sizes and pore architectures were prepared and modified with amine functional groups by a postgrafting method. The carbon dioxide (CO2) adsorption on these amine-modified OMSs was measured by using microbalances at 348 K, and their adsorption capacities were found to be 0.2-1.4 mmol g(-1) under ambient pressure using dry 15% CO2. It was found experimentally that the CO2 adsorption capacity and adsorption rate were attributed to the density of amine groups and pore volume, respectively. A simple method is described for the production of densely anchored amine groups on a solid adsorbent invoking direct incorporation of tetraethylenepentamine onto the as-synthesized OMSs. Unlike conventional amine-modified OMSs, which typically show CO2 adsorption capacity less than 2 mmol g(-1), such organic template occluded amine-OMS composites possessed remarkably high CO2 uptake of approximately 4.6 mmol g(-1) at 348 K and 1 atm for a dry 15% CO2/nitrogen feed mixture. The enhancement of 8% in CO2 adsorption capacity was also observed in the presence of 10.6% water vapor. Durability tests done by cyclic adsorption-desorption revealed that these adsorbents also possess excellent stability.
authors.affiliation: Department of Chemical and Materials Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung, Taiwan. shliu@cc.kuas.edu.tw
authors.forename: Shou-Heng
authors.initials: SH
authors.lastname: Liu
authors.forename: Yuan-Chung
authors.initials: YC
authors.lastname: Lin
authors.forename: Yi-Chi
authors.initials: YC
authors.lastname: Chien
authors.forename: Han-Ren
authors.initials: HR
authors.lastname: Hyu
mesh_terms: D000327:Adsorption; D002245:Carbon Dioxide / Q000302:isolation & purification*; D005029:Ethylenediamines / Q000737:chemistry*; D017752:Greenhouse Effect / Q000517:prevention & control*; D017646:Organosilicon Compounds / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*
chemical_list: D005029:Ethylenediamines; D017646:Organosilicon Compounds; D002245:Carbon Dioxide; D012822:Silicon Dioxide; C034269:tetraethylenepentamine